Abstract
By carrying out decarbonation of CO_3^<2->type MgAl-LDH (layered double hydroxide) using an acetate-buffer/inorganic salt solution under N_2 flow, CO_3^<2->LDH was successfully converted into Cl^-, ClO_4^- and NO_3^-LDHs, which contain only a little residual CO_3^<2->, in one step under mild conditions. Due to the anion-exchangeability of these derived LDHs, they serve as suitable intermediates for the preparation of LDH hybrids. When organic salts such as sodium p-toluenesulfonate were used instead of inorganic salts, incorporation of organic anions was found to occur. However, the amount of incorporation depend on the layer charge of LDH host materials. Other decarbonation methods of LDHs such as acid-salt method are reviewed and the remaining problems are discussed.
